Intercrural sex (from "inter-" and Latin "crura", legs), also known as femoral/interfemoral sex/intercourse, is a type of non-penetrative sex, in which a male places his penis between his partner's thighs (often with lubrication), and thrusts to create friction.

The sex education and sexual experimentation of adolescents may feature intercrural sex in the interests of avoiding pregnancy or preserving virginity. Shere Hite's 1976 and 1981 research on female sexuality found that some adult women reported being able to achieve orgasm via intercrural contact to stimulate the clitoris. A variation of heterosexual intercrural sex is a practice known in Japan as sumata.

Though Judaism and modern scholarship maintain that intercrural sex is not specifically condemned by Leviticus 18 or 20, it has been subject to various historical sodomy laws and religious restrictions enacted mostly by Christianity. Intercrural sex appears to have been common during the medieval era; for example, a contemporary document titled the "Altercatio Ganimedis et Helene" (The Debate of Helen and Ganymede) depicts Greco-Roman mythical figure Ganymede describing the "slippery thighs of a boy" as superior to the "stink and gaping looseness of the female cave". Intercrural sex is still quite common in some communities. A 1997 report on the sexual health needs of MSM in the Calcutta suburbs found that 73% of men asked engaged in intercrural sex, though the frequency varied based on demographic factors: only 54% of sex workers, 50% of lower income men and 40% of Muslims reported intercrural sex; while 82% of Hindus and 88% of middle income men reported engaging in it.